Ticket #25266: 25266.patch

src/wp-includes/cron.php

@@ -169 +169 @@
                 return false;
         }
 
+        $event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'args' => $args );
+        /**
+         * Filter a single event before it is unscheduled.
+         *
+         * @param object $event An object containing an event's data.
+         */
+        $event = apply_filters( 'unschedule_event', $event );
+
+        // A plugin disallowed this event to be unscheduled
+        if ( ! $event )
+                return false;
+
         $crons = _get_cron_array();
-        $key = md5(serialize($args));
-        unset( $crons[$timestamp][$hook][$key] );
-        if ( empty($crons[$timestamp][$hook]) )
-                unset( $crons[$timestamp][$hook] );
-        if ( empty($crons[$timestamp]) )
-                unset( $crons[$timestamp] );
+        $key = md5(serialize($event->args));
+        unset( $crons[$event->timestamp][$event->hook][$key] );
+        if ( empty($crons[$event->timestamp][$event->hook]) )
+                unset( $crons[$event->timestamp][$event->hook] );
+        if ( empty($crons[$event->timestamp]) )
+                unset( $crons[$event->timestamp] );
         _set_cron_array( $crons );
 }